Quality Control of Thermally Modified Timber Using Dynamic Vapor Sorption (DVS) Analysis
| Autor: | Rožle Repič, Lukas Emmerich, Boštjan Lesar, Romana Cerc Korošec, Gregor Rep, Christian Brischke, Miha Humar, Davor Kržišnik |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
dinamična sorpcija vodne pare Materials science 01 natural sciences kontrola kakovosti termična modifikacija Fagus sylvatica les Aluminium foil 010608 biotechnology Thermal dynamic vapour sorption udc:630*8 quality control Beech Water content moisture content 040101 forestry biology Forestry Picea abies 04 agricultural and veterinary sciences lcsh:QK900-989 Pulp and paper industry biology.organism_classification thermal modification Laboratory oven lcsh:Plant ecology 0401 agriculture forestry and fisheries Dynamic vapor sorption vlažnost lesa wood |
| Zdroj: | Forests, Vol 11, Iss 666, p 666 (2020) Forests, vol. 11, no. 6, 666, 2020. Forests Volume 11 Issue 6 |
| ISSN: | 1999-4907 |
| Popis: | The importance of thermal modification is increasing worldwide. Increased use of thermally modified timber (TMT) has resulted in a need for reliable quality control, comprising control of variation of the production within defined limits, allowing third-party control in the case of certification and the regulation of customer complaints and claims. Techniques are thus needed to characterise the modification of quality in terms of improved target properties of TMT during industrial production, and of TMT products that have been in service for an arbitrary time. In this study, we aimed to utilise dynamic vapor sorption (DVS) for this purpose. Norway spruce (Picea abies) and European beech (Fagus sylvatica) samples were thermally modified at different temperatures according to different heat treatment techniques: (1) the Silvapro process based on an initial vacuum (2) an air heat treatment, whereby samples were wrapped in aluminium foil (3) thermal modification of wood samples in the ambient atmosphere in a laboratory oven. Wood samples from closed processes were analysed for validation. TMT was characterised with respect to mass loss, colour and density. Mass loss of wood due to modification (MLTM) was correlated with factors derived from DVS analysis. The present DVS measurements suggest that the equilibrium wood moisture content (EMC95% RH), the time to reach 10% wood moisture content (t10% MC), and the elongation factor, c, derived from a logarithmic function, can serve as alternative parameters to characterise the quality of several thermal modification processes. Further studies are recommended using other wood species, different modification processes and further parameters gained from DVS measurements to understand the robustness and the predictive power of the applied technique. |
| Databáze: | OpenAIRE |
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